If the smith has a frame mounted lock avoid it. Numerous instances of them locking themselves under recoil. Either disable it or dont buy one with the sw lock.

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"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith

The problem with being stupid is you cannot simply decide to stop doing dumb things...

I still would encourage shooting them first or at the very least, having your wife make the pick based on comfort. It really does come down to preference/grip/recoil etc. At that point, one having a beam on it wont matter if the fit isn't right.